/*
 * ProGuard -- shrinking, optimization, obfuscation, and preverification of Java bytecode.
 *
 * Copyright (c) 2002-2018 GuardSquare NV
 *
 * This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public
 * License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later
 * version.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied
 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along with this program; if not, write to the Free
 * Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */
package proguard.io;

import proguard.classfile.*;
import proguard.classfile.io.ProgramClassWriter;
import proguard.classfile.util.SimplifiedVisitor;
import proguard.classfile.visitor.ClassVisitor;

import java.io.*;

/**
 * This ClassVisitor writes out the ProgramClass objects that it visits to the given DataEntry, modified to have the
 * correct name.
 *
 * @author Eric Lafortune
 */
public class DataEntryClassWriter extends SimplifiedVisitor implements ClassVisitor {
    private final DataEntryWriter dataEntryWriter;
    private final DataEntry templateDataEntry;

    /**
     * Creates a new DataEntryClassWriter for writing to the given DataEntryWriter, based on the given template
     * DataEntry.
     */
    public DataEntryClassWriter(DataEntryWriter dataEntryWriter, DataEntry templateDataEntry) {
        this.dataEntryWriter = dataEntryWriter;
        this.templateDataEntry = templateDataEntry;
    }

    // Implementations for ClassVisitor.

    public void visitProgramClass(ProgramClass programClass) {
        // Rename the data entry if necessary.
        String actualClassName = programClass.getName();
        DataEntry actualDataEntry =
            new RenamedDataEntry(templateDataEntry, actualClassName + ClassConstants.CLASS_FILE_EXTENSION);

        try {
            // Get the output entry corresponding to this input entry.
            OutputStream outputStream = dataEntryWriter.createOutputStream(actualDataEntry);
            if (outputStream != null) {
                // Write the class to the output entry.
                DataOutputStream classOutputStream = new DataOutputStream(outputStream);
                try {
                    new ProgramClassWriter(classOutputStream).visitProgramClass(programClass);
                } finally {
                    classOutputStream.close();
                }
            }
        } catch (IOException e) {
            throw new RuntimeException("Can't write program class [" + actualClassName + "] to [" + actualDataEntry
                + "] (" + e.getMessage() + ")", e);
        }
    }
}
